Yoo dude !
considering the fact that is announced 8 weeks of flowering by barney's…. yeah your buds seems small.
but often it takes also more than announced.
to my point of view there is one thing that you could do now to try to boost your grow…
add a watering solution 22/24 °C (Depending on your tent temperature) with symbiotics fungies (mycorhizae and trichoderma + if u can some bacterias) and you add a litle bit of bio molasses with them (3 ml /L for sugar) in order to accelerate the development of these micro-organisms….It is advisable to put a little pinch of this fungies on three 7cm holes deep, holes that you will then close before watering the solution
normally this mix In addition to stimulating flowering, is possible to break the blocking of eventual nutrients… and it will restore the soil activity as it best…
where you from ? the nutrient company in UK have a good pack, including bacterias.
but if i have an advice it is alway use symbiotics fongies at start,
when you transplant and after 2/3 weeks of blooming stage 👍
last question what is your led light ? (ref plse)
Hope it will helps. Namasté 🙏